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A passive infrared sensor (PIR sensor) is an electronic sensor that measures infrared (IR) light radiating from objects in its field of view. They are most often used in PIR-based motion detectors . PIR sensors are commonly used in security alarms and automatic lighting applications.
A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.
Speed sensors are machines used to detect the speed of an object, usually a transport vehicle. They include: Wheel speed sensors; Speedometers; Pitometer logs; Pitot tubes; Airspeed indicators; Piezo sensors (e.g. in a road surface) LIDAR; Ground speed radar; Doppler radar; ANPR (where vehicles are timed over a fixed distance)
Sensors: In a security alarm, some sensors detect intrusions. Sensors' locations are at the perimeter of the protected area, within it, or both. Sensors can detect intruders by different methods. Alerting devices indicate an alarm condition. Most commonly, these are bells, sirens, also and or flashing lights. Alerting devices serve the dual ...
The F-4 Phantom had a Texas Instruments AAA-4 infrared seeker [4] under the nose of early production aircraft F-4Bs and F-4Cs. It was not not installed on later F-4Ds due to limited capabilities, [ 5 ] but retained the bulge and indeed some F-4Ds had the IRST receiver retrofitted in a modified form.
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Velocity receivers differ from position and acceleration sensors in terms of what they measure and how they are used. Position sensors measure the location of an object, while acceleration sensors measure the rate of change of velocity. Velocity sensors provide real-time speed information, often used to track or control movement accurately.
Stout said Texas troopers have engaged in roughly 500 high-speed pursuits in his border county alone this year, more than half of which exceeded speeds of 100 mph (160 kph).
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